Bug report - erroneous week %U and year %L numbers in printf

[adam-allgood]

Date::Manip::Date is returning erroneous values for the week of the year and the year as we progress from the end of 2025 into 2026. To reproduce the error, I used the following short script (after a clean install of Date::Manip::Date using cpanm into a directory called cpan in the same location as the test script):

#!/usr/bin/env perl

use strict;
use warnings;
use FindBin;
use lib "$FindBin::Bin/cpan/lib/perl5";
use Date::Manip::Date;

my $day1 = Date::Manip::Date->new();
$day1->parse("December 28, 2025");
my $day2 = Date::Manip::Date->new();
$day2->parse("January 4, 2026");
print $day1->printf("day1 is %a %Y-%m-%d\n");
print $day1->printf("day1 is week %U of year %L\n");
print $day2->printf("day2 is %a %Y-%m-%d\n");
print $day2->printf("day2 is week %U of year %L\n");

exit 0;

The results of running this script are:

day1 is Sun 2025-12-28
day1 is week 01 of year 2026
day2 is Sun 2026-01-04
day2 is week 01 of year 2026

This is incorrect, as Sun 2025-12-28 should be in week 52 of 2025.

I have tested this on systems running Debian 13 (perl v5.40.1) and RHEL8 (perl v5.26.3). The Date::Manip::Date version from CPAN is 6.98.